Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7b13fc75bb6f65…

MALICIOUS

PDF

75.9 KB Created: 2021-06-28 03:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a53638df845359b90eb0e08423a30951 SHA-1: 451c2eddeda8fd90477430a8122ee011b2ccc946 SHA-256: 9b7b13fc75bb6f6550ebf1dff1e67c9585d46d419c572608f93a6823cfe664b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious or phishing content, aiming to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/afa8a74dd39c5c2942dc3786d5bf4bd2/58839501864.pdf
    • https://luyenthitoeic.info/userfiles/file/mesagejidugepixikorigu.pdf
    • http://i-daa-wl.de/userfiles/zowasivaxid.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/303c2159fe8a2c0b2c79b3e698c6f908/redilafejasurokuj.pdf
    • https://drticket.ir/basefile/drtiketcom/files/1835106867.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/dg1ebga8fveh4ejbn7q7enn4r6/wapanewabaketajeromexesi.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b14161d16---85962915782.pdf
    • http://winso.tw/userfiles/file/xejutekoburijuzuregu.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089144d48458---genumape.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/teretubavumivozasakefin.pdf
    • http://domholidays.com/userfiles/file/xoxebafufowesa.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/0ba869b22eeadaaaf22efe7b1ca1722a/memufesefazejaw.pdf
    • https://artlabjo.com/userfiles/file/xebagamomamuwanug.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d83ab4d9ff6e7e398e925296f7224889/kubeterel.pdf
    • https://anukulagrotech.com/userfiles/file/12665208568.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d61c971ba26---nogutedalota.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tarot+cards+images+download+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c566.bin
6061128ba97b85c7be850cca62755d1a4262a6ebbd7c92578a2eacee6e90875b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 10868 bytes
font_01_sfnt_off0000de5e.bin
113eda8a2ee886fa0bd08f3d6e0a88d2437cd34240950a7d1c55548675c0a41a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 17032 bytes
font_02_sfnt_off00010b08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 16792 bytes

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